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Question

(ΔH  ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is ( R = 8.314 J K1 mol1)



Your Answer
A

−2477.57  J mol-1

Your Answer
B

2477.57  J mol-1

Your Answer
C

−1238.78 J mol-1

Correct Answer
D

1238.78   J mol-1


Solution

The correct option is A

1238.78   J mol-1


C(s) + 12O2(g)  CO

ΔH = ΔU + ΔnRT or ΔH  ΔU = ΔnRT;

Δn = 1  12 = 12;ΔH  ΔU = 12 × 8.314 × 298

= 1238.78 J mol1

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